shall we, about about the e-mail resignation of the former cia director david petraeus. u.s. official tells cnn that petraeus' extramarital affair came into light because his biographer paula broadwell was sending harassing e-mails to a woman close to petraeus. earlier i asked why would the fbi investigate cia e-mails. >> because the fbi has jurisdiction if someone uses the internet to threat another person, so that's where the investigation began. it was not against director petraeus. it was because threats were being received over the internet and since they're coming in to someone working at cia headquarters and particularly in the executive area, that prompted the fbi to go ahead and investigate the threat. >> okay, so the big concern here then, that an outsider could have access quite simply to sensitive information and intelligence. >> well, that's the concern, when it starts, but when you look into that, in the cia or fbi headquarters or any of the intel agencies, often you have dual computer systems to that you can receive outside e-mails because someone might send a